Impact of engine combustion on the reactivity of diesel soot from commercial vehicle engines

Abstract

The regeneration behavior of diesel particulate filters is significantly influenced by the reactivity of the stored soot. However, there is still a lack of analyses which describe the effects that various engine operating parameters have on soot reactivity. A medium-duty OM936 single-cylinder engine with a common rail injection system was used to analyze the correlations between engine speed, swirl, combustion air–fuel ratio and soot reactivity. Diesel particulate samples were directly collected from the exhaust stream. The temperature programed oxidation was used to reveal the reactivity to oxygen of the soot samples. Diesel particulate filter regeneration experiments were additionally carried out on a medium-duty OM936 full engine test bench to analyze the influence of soot reactivity on the regeneration efficiency in particulate filters. The results give new insights into the relation between the diesel engine combustion process and soot reactivity and show how the active regeneration of diesel particulate filters is affected by soot reactivity.

Analysis of Soot from the Use of Butanol Blends in a Euro 6 Diesel Engine

“…Different previous studies have analyzed the effects of the engine speed 15,38 and load 15,18,28,38−40 on the characteristics of soot particles; therefore, the effect of butanol content is analyzed here in a singleengine mode. The operation mode selected is illustrative of urban driving conditions, and it represents an acceleration from 15 to 32 km/ h. This engine condition reproduces a low-load operation mode characterized by its high emission of particulate matter, resulting in a high contribution to the DPF loading, and its relatively low exhaust temperature, which prevents from spontaneous regeneration of soot in the DPF.…”

“…Different previous studies have analyzed the effects of the engine speed , and load ,,,− on the characteristics of soot particles; therefore, the effect of butanol content is analyzed here in a single-engine mode. The operation mode selected is illustrative of urban driving conditions, and it represents an acceleration from 15 to 32 km/h.…”

Why Soot is not Alike Soot: A Molecular/Nanostructural Approach to Low Temperature Soot Oxidation

“…The ICE soot was complemented by samples from a commercial Diesel Direct Injection engine at injection pressures of 2200 bar, 1600 bar and 1200 bar (C50_2200, C50_1600, C50_1200). Sampling procedure and engine description is delineated in Lindner et al (2014). For comparison commercial carbon black samples were investigated.…”

Editorial: Thermo- and fluid-dynamic processes in direct injection engines – THIESEL 2014 Special Issue

“…Selected papers include two papers related to fuel injection, 4,5 two papers on turbocharging 6,7 and seven papers on combustion. [8][9][10][11][12][13][14] With respect to the articles selected for the injection part, in the work of Watanabe et al, 4 the visualization of cavitation inside real-size nozzles is presented for different nozzle seats changing the sac volume, finding that vortex flow within the sac affects the spray characteristics at the beginning of needle lift. 3 The visualization of the cavitation phase in real-size nozzles has been a very active research work as could be observed from the work of Reid et al 15 To pass from fuel injection system to combustion, the most common situation is to use one-dimensional code for injection modelling 16,17 or to make use of zero dimensional codes for the prediction of spray characteristics.…”

“…Two singlecylinder engines were used for combustion, one from Istituto Motori 8 to study high-glycerol ethers/diesel blends and one from KAIST and University of Orleans 12 to study JP-8 fuel effect on premixed charge ignition in a diesel engine. Finally, there is one paper about improvements in thermal efficiency of premixed diesel combustion 11 and the work by Lindner et al 13 that found that the structure and composition of the soot are mainly influenced by the late combustion phase in a diesel commercial vehicle engine.…”